I loved the Game of Thrones series. I wish the author would finish the series!!! So many threads to keep track of, they are all-engrossing books.
At the moment I'm alternating reading books from two different series which I'm finding highly addictive:
The Rivers of London series by Ben Aaronovitch (I'm reading 5 of 5 books)
The Wheel of Time series by Robert Jordan (I've read 2 of 14) - think cross between Game of Thrones and Harry Potter.
The best book I've read in the last few months would have to be The Light Between Oceans by M.L. Stedman - a beautiful but heartbreaking story. I just had to keep reading to find out how it ended.
I also loved Wolf Hall by Hilary Mantell. Gotta love a good historical fiction. The second book Bringing Up the Bodies wasn't quite as good but I'm still looking forward to the third instalment when it's eventually released.